diff --git a/test-requirements.txt b/test-requirements.txt
index 629840c36..8f8f75526 100644
--- a/test-requirements.txt
+++ b/test-requirements.txt
@@ -2,3 +2,4 @@ pre-commit # MIT
 netaddr # BSD
 stestr>=2.0.0 # Apache-2.0
 oslotest>=3.2.0 # Apache-2.0
+mock